Abstract
The CHErenkov/Scintillation Separation experiment (CHESS) has been used to demonstrate the separation of Cherenkov and scintillation light in both linear alkylbenzene (LAB) and LAB with 2 g/L of PPO as a fluor (LAB/PPO). This is the first successful demonstration of Cherenkov light detection from the more challenging LAB/PPO cocktail and improves on previous results for LAB. A time resolution of 338pm 12 ps FWHM results in an efficiency for identifying Cherenkov photons in LAB/PPO of 70 pm 3 % and 63pm 8% for time- and charge-based separation, respectively, with scintillation contamination of 36pm 5% and 38pm 4%. LAB/PPO data is consistent with a rise time of tau _r=0.72pm 0.33 ns.
Highlights
The ability to separate Cherenkov and scintillation light in liquid scintillator (LS) detectors would enable a new generation of optical detectors that could achieve directional reconstruction at low energy thresholds, with powerful particle identification and event discrimination capabilities [1]
In linear alkylbenzene (LAB) the 48◦ and 6.5-cm target-photomultiplier tubes (PMTs) spacing results in an inner radius for the Cherenkov ring of approximately 7.2 cm, while the additional 3-cm target height puts the outer edge at 10.6 cm
The hit-time residual distributions for LAB are shown in Fig. 7 individually for the three radial PMT groupings, for data and Monte Carlo (MC)
Summary
The ability to separate Cherenkov and scintillation light in liquid scintillator (LS) detectors would enable a new generation of optical detectors that could achieve directional reconstruction at low energy thresholds, with powerful particle identification and event discrimination capabilities [1]. Such a detector would have applications across particle, nuclear, and astrophysics including a next-generation search for neutrinoless double beta decay, unprecedented sensitivity to solar neutrinos, proton decay, and sensitivity to the neutrino mass hierarchy and CP violation if deployed in a neutrino beam [1,2]. 3 introduces the data taking procedure and analysis The results for both target materials are presented in Sect.
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